which starter is used for synchronous motor
Answer Posted / kesavulu
Generally Synchronous motors are not self starting motors.
A pony motor is required to rotate and D.C extitation is
also required.Liquified rotary starters are used
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
wht is embedded systems? what is new inthis field?
1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.
during installation time of transformer and alternator which points we have to observed?
Draw the single line diagram of the power station?
What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?
when qty of cable being purchased is not sufficient according to the standard,what should the inspector do to ensure its quality according to the standard?
I WANT TO know WHICH WAY IS BETTER FOR CONNECTION BETWEEN POWER TRANSFORMER AND MAIN DISTRIBUTION PANEL. 1-IS BETTER WE USE CABLE? 2-IS BETTER WE USE BUS DUCT? my transformer rate power is 2500KVA
Application Comparison between 22KV (UE)and 33KV (E) system. Are we allowed to use 33KV (E) cable in lieu of 22KV (UE) cable. What are the technical disadvantages.
How can we calculate the KVA rating of a Distribution transformer from its core details?
How much ph is maintained of water electrolyte which is used in LRS for 1200 kw slipring induction motor ?
how to test reverse power trip?
WHY EARTHING NOT NEEDED IN BATTERY IN SUBSTATION
how to protect motor in dol starter having capacity of 30 hp.40 hp?
For high frequency application we use which transformer?
Why the moulded plug comes with domestic appliances instead of assembled plug like anchor, Vinay 5/15 A.